Study on the State of Stress around Earthquake Swarm Areas Using P-Wave Polarity Data: Nikko-Ashio and Teishi Knoll Areas.
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- Rocco Guillermo F. E.
- Research Center for Prediction of Earthquakes and Volcanic Eruptions, Faculty of Science, Tohoku University
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- Horiuchi Shigeki
- Research Center for Prediction of Earthquakes and Volcanic Eruptions, Faculty of Science, Tohoku University
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- Hasegawa Akira
- Research Center for Prediction of Earthquakes and Volcanic Eruptions, Faculty of Science, Tohoku University
書誌事項
- タイトル別名
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- Study on the State of Stress around Ear
- Nikko-Ashio and Teishi Knoll Areas
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説明
We have estimated the stress tensor at two earthquake swarm areas in Japan, Nikko-Ashio, Tochigi Prefecture and off Ito, Izu Peninsula, by applying a technique that inverts P-wave polarity data for a large number of events under the following assumptions: 1) Stress field in a small region is uniform, 2) slips occur along pre-existing weak planes randomly distributed in the region, and 3) slip direction is parallel to the direction of the maximum shear stress. We inverted data collected by the 1993 Joint Seismic Observation in the Nikko-Ashio area. The estimated maximum principal stress in this area is nearly horizontal in the NW-SE direction and the minimum principal stress is sub-vertical. Moreover, the state of stress just beneath Nikko-Shirane Volcano is different from that in the surrounding areas. The orientation of the minimum principal stress is sub-horizontal and perpendicular to the strike direction of opening cracks found at the top of Mt. Nikko-Shirane, an active quaternary volcano. This local change is probably related to recent magmatic activity. We also analyzed data from the 1989 Teishi Knoll eruption area. The estimated direction of the minimum principal stress is parallel to that of the maximum extension of the crustal deformation measured during the submarine eruption at Teishi Knoll. Spatial variations in the state of stress off Ito were found to be small.
収録刊行物
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- Journal of Physics of the Earth
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Journal of Physics of the Earth 45 (1), 29-40, 1997
公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会
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詳細情報 詳細情報について
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- CRID
- 1390282681488000384
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- NII論文ID
- 130003963250
- 10002428638
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- NII書誌ID
- AA00704960
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- ISSN
- 18842305
- 00223743
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- NDL書誌ID
- 4231059
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- 本文言語コード
- en
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- データソース種別
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- NDLサーチ
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